Is my token sent to a server?
No. The decoding happens locally in your browser using standard APIs.
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Security
JWT Decoder
Decode and analyze JSON Web Tokens securely in your browser. Your tokens are processed locally and never sent to any servers.
Privacy
Tool workspace
How JWT decoding works
Paste a JSON Web Token into the input field. The tool safely decodes the Base64Url encoded header and payload and displays them as formatted JSON.
Use cases
Inspect token contents during authentication development, verify standard claims like expiration, and debug issues with access tokens.
Privacy
Your token is decoded securely in your browser memory. It is never sent to a server, ensuring your sensitive access tokens stay private.
Limitations
This tool decodes tokens for inspection but does not verify their cryptographic signatures.
JWT Decoder FAQ
Does this tool verify the signature?
No. The tool only decodes the header and payload for inspection. It does not check if the token is properly signed or tampered with.
Why do I see an invalid token error?
JWTs must have exactly three parts separated by dots. If the token is missing parts or not properly base64-encoded, it cannot be decoded.
Are the decoded contents stored?
No. The decoded contents stay in browser memory and disappear when you reload the page.
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